Apparently some front derailleurs were made with a certain seat tube angle in mind. A touring triple front derailleur, I would guess, was designed with a 72 -73 degree seat tube angle in mind, and a racing double was designed with a 74 or even 75 steep angle in mind. When you attach a derailleur and tighten down, you can get the lip of the fd to not match the curvature of the chainwheel. Fortunately I have a braze on attachment so I fashioned a thin copper shim to go between the derailleur and the braze on tab, above the bolt that holds everything in place. When I tightened down on the allen bolt the derailleur changed it's angle and then seemed to match. This seems like a successful mod, (invisable, simple, reversible and cheap). Has anyone done this, or is there a better method I could have employed?
Garth Libre in Miami Fl USA